Editing Chromate and dichromate (section)

=== Oxidation–reduction properties ===
The chromate and dichromate ions are fairly strong [[oxidizing agent]]s. Commonly three electrons are added to a chromium atom, [[reduction (chemistry)|reducing]] it to oxidation state +3. In acid solution the [[aqueous solution|aquated]] {{chem2|Cr(3+)}} ion is produced.
:{{chem2|Cr2O7(2−) + 14 H+ + 6 e− → 2 Cr(3+) + 7 H2O}}{{spaces|5}} ''ε''<sub>0</sub>&nbsp;=&nbsp;1.33&nbsp;V
In alkaline solution [[chromium(III) hydroxide]] is produced. The [[redox potential]] shows that chromates are weaker [[oxidizing agent]] in [[alkaline]] solution than in [[acid]] solution.<ref name="HollemanAF">{{Holleman&Wiberg}}.</ref> 
:{{chem2|CrO4(2−) + 4 H2O + 3 e− → Cr(OH)3 + 5 OH-}}{{spaces|5}} ''ε''<sub>0</sub>&nbsp;=&nbsp;−0.13&nbsp;V